论文部分内容阅读
颗粒之间的毛细作用是分析湿颗粒体系力学特性的一个重要方面。考虑两球形颗粒与粒间弯液面的相互作用,采用打靶法求解得到了粒间气-液-固交界面的几何形状与基质吸力关系的精确解答,并与环形近似方法和数据拟合方法得到的粒间作用力进行了比较,分析了两种简化方法的精确度。在此基础上,分析了不同粒间间距、液-固接触角以及基质吸力时,两球形颗粒间由毛细作用引起的吸应力特征曲线。分析结果表明,当液体体积较小时,拟合方法得到的结果更好,而当液体体积较大时,采用环形近似得到的结果要比拟合方法更接近精确解,为非饱和土中吸力的认识以及非饱和土力学微观分析提供了一定的理论指导。
The capillary action between particles is an important aspect of analyzing the mechanical properties of wet particle systems. Considering the interaction between the two spherical particles and the interparticle meniscus, the exact solution of the relationship between the geometry of the gas-liquid-solid interface and the substrate suction was obtained by the shooting method. The results were compared with the ring approximation method and data fitting method The resulting intergranular forces were compared and the accuracy of the two simplified methods was analyzed. On this basis, the characteristic curves of the suction force caused by the capillary action between two spherical particles at different particle-to-particle spacings, liquid-solid contact angles and matrix suction were analyzed. The analysis results show that the fitting result is better when the liquid volume is smaller, and the result obtained by the ring approximation is closer to the exact solution than the fitting method when the liquid volume is larger, Understanding and micro-analysis of unsaturated soil mechanics provide some theoretical guidance.